How do I reduce my file size?
Have you turned on file compression?



Other Alternative would be to zip - trying to zip a already compressed file would make little difference - your file up and try other cloud services like dropbox or mega.co.nz. if your file is just too big.

If you file contains animated simulation data, it's wise to delete them before uploading the file. Also you will want to keep what is necessary to discuss the issue you were having, meaning deleting all the other elements that would not matter to the problems on hand.

CONCLUSION
78mb on the one circuit board object named "curve.001". It's the poor conservation of polygons. Meaning your object have too many polygon for it's purpose. The film strip object is too high res in the mesh count too, with very bad topology if you want it to bend nicely along a bezier curve.